Printing frame and stand



Nov. 10,1931. H. c. JONES PRINTING FRAME AND STAND Filed July 14, 1928- 3 Sheets$heet 1 gvwemtoi Harry 63.70126;

Nov. 10, 1931. H. c. JONES 1,831,389

PRINTING FRAME AND STAND Filed July 14, 1928 3 Sheets-Sheet 2 in; ATTORNEY Nov. 10, 1931. H. c JONES 3 L PRINTING FRAME AND STAND Filed July 14, 1928 3 Sheets-Sheet 3 INVENTOR flarzy 6.21%; A TTORNFlY Patented Nov. 10,

may c. .ro1ms, on NEW YORK, N.'Y.

rnm'rme STAND Application. filed m 1;,

This invention relates to frames and support stands for photographic printing appa-- positive in connecratus using a sensitized tion with anegative. 'In this application the term negative, as used throughout, is understood to refer either to a rigid or flexible plate, film, etc."

made of any transparent or translucentsubstance as glass, celluloid or analogous mate'- rial, paper and textile fabrics, treated to per-. mit the passage of actinic light, and bearing images or legends, inscribed manually or mechanically, or deposited photographically, of any object or matter, or having the same attached in such manner as to be reproduced by photo-printing. The word positive is likewise to be con- 'strued as relating to a receptive element of corresponding nature, sensltized to receive 21v a photograph1c.1mpress1on from the negative when brought and held in proper relation and subjected to actinic light. One of the purposes of the present invention is to provide a circumambient sealing 2-- means, set in the plate carrying frame structure, exteriorally of the plate and its clamping devices, to receive a negative, acting as a yielding, air-tight, cushioned seat for a juxtaposed plate, the clamping means being accessible for adjustment from beyond the air seal and without disturbing it in operation.

Another object is to provide an inner sealing means, set in the frame within the zone of the outer sealing means, and on which 5 the margin of the negative is seated.

A further feature is in'the provision of means for introducing a vacuum between the positive and negative whereby they are drawn firmly together b suctiononly, no y auxiliary clamping or 10c ing means of any kind being employed to bind the plates in juxtaposition. Also .within the scope of the invention is the provision of a compact, portable stand in which is pivoted a frame to contain a plate, either positive or negative, so that-the same may be turned to face in either direction or at an angle, another plate carrying frame being arranged in-the stand to be raised and lowered, the second frame being guided inits 1928. Serial No. 292,877.

11103811181113, counter-balanced and crank actu ate These and other important purposes, as will later appear, are attained by the novel construction and combination of parts, asfi hereinfter described and shown in'the accompanying drawings, constituting an essential. portion of this disclosure, and in which z- Figure 1 is a transverse sectional view of a plate support frame including inner and outer elastic sealing elements and a novel clamping device.

Figure2 is a sectional view taken on line 2-2 of Figure 1.

Figure 3 is a partial transverse sectional view of a negative plate frame showing another improved construction;

Figure 4 is a similar sectional view illustrating a modified type of frame construction, including a different plate clamping 79 means. v

Figure 5 is a like view of plate clamp frame and its attaching means.

Figure 6 is another similar view of a frame having a simple form of clamp.

Figure 7 s a further ilustration of frame structure showing a modified plate attaching means.

- Figure 8 is a fragmentary perspective view of the inner air-sealing filler strip as used in the several frames. 4

Figure 9 is a perspective view of a photographic plate stand as made in accordance with the invention.

s Figure 10 isa side elevational view of the same.

Figure 11 is a side elevational view of a modified form of frame stand, parts of the frames being broken awayto-show the structure.

Figure 12 is a fragmentary sectional view taken one line 1212 of Figure 11 and drawn to an enlarged scalej Figure 13.is a pers ective detail the frame trunnions, larged scale.

The'stand is composed of a platform 10 mounted on casters 11 and provided at its opposite ends with raised plates 12 between whichis base plate 13, see Figures 9 and 10.

view of awn to a further en- Fixed rigidly at the ends of the platform 10 are a pair of uprights 1415 connected at their upper ends by a bolt 16, below which is a rotatably mounted spindle 17 provided on its outer extending end with sprockets 18.

A negative frame, genericall designed by the numeral 20, is supported y pintles 19 passing through openings in the uprights at a convenient height from the base. 4

A plate frame 22 is similarly provided with rectangular studs 21 passing through slots 23 formed centrally in the upper portion of the uprights to move freely up and down therein.

The lower ends of the slots 23 are in open communication with arcuate slots 24 curved towards the front and rear of the uprights, to the radius of the pintles 19, whereby the frame 22 may be brought into juxtaposition with the frame 20 and both turned, as a unit, on the pintles 19 in either direction.

The frame 22 is supported at its ends by brackets 25 to which are attached the ends of chains 26, the same passing over the sprockets 18, which act as idlers, and at their lower ends is attached an elongated weight 27 counterb'alancing the frame which is prevented from turning from a horizontal position by the studs 21 sliding in the slots.

The frame 22 is raised and lowered by actuating a crank 28 having a spindle 29 journalled in the upright 14 and carrying a sprocket 3Q engaging the teeth of the adjacent chain, which by reason of the sprocket 18 and shaft 17, produces a uniform motion in the .chain at the oppositeside, thereby moving the frame 22 in a plane at all times parallel with the frame 20.

Mounted on the base 13 is a motor '35 ar ranged to drive an air pump 36 bywhich a partial vacuum may be produced and air exhausted from between the frames 20-22 throu h a flexible tube 37, the same being provi ed .with a gage 38 attached to the side of the stand as seen in Figure 9, the motor and pump appearing in Figure 10.

Various modifications of the negative frames appear in Figures 1 to 7 inclusive, all of which may be"interchangeably secured to the main frames 20-22.

The frame carrier 20, shown in broken lines in Figure 5, has mounted on it a negative frame 40 provided with movable arms 41 having openings at their outer portions engageable with dowels in the negative frame carrier to be clamped by knobs 43 when in adjustment.

As illustrated in Figure 5, the negative frame 40 is quite simple, consistingof a rigid rectangular structure having a marginal flange 44 seated on the frame carrier 20, its level upper surface furnishing a support for the negative 45, here shown as a beveled edged glass plate.

Formed in the upper surface of the frame 40, outside of the negative, is a circumambient recess 46 of rectangular cross section,

adapted to receive the correspondingly shaped base portion 47 of a rubber or like elastic air sealing device, the same being provided with an outwardly extending, slightly raised marginal portion 47 converging to a thin outer edge, providing an effective air seal when pressed against a positive plate supported in a mating frame or bed B. At spaced intervals in the frame 40 are pockets 48 open at the top within the margin of the rubber seal, these pockets loosely containing clamp members 49 having reduced angular inbent upper ends 49 to engage the bevelled edges of the negative 45 whereby it is rigidly held in position.

Pa sing through the body of the clamps 49 are jcrews 50 threaded into the body 40, these screws having bevelled heads fitting countersinks in the clamps to be flush with their outer surfaces. I

The screws may be introduced through openings 51 in the outer portions of the frame, the openings being utilized to carry rotatable screw adjusting devices 52 having stems provided with knurled actuating knobs 53 exterior of the frame, and are held in place by plates 54 secured on the outer surfaces of the frame, but obviously clamp adjusting means other than screws may be used.

It will be noted that in order to change negatives, V the rubber sealing element 47 must be removed to permit the tang of the adjusting device 52 to engage the slot in the screw head.

As shown in Figure 5, one of the pockets 48 is provided with a passage in which is fixed a tube 55 connected at its outer end with a flexible tube 37, leading to the vacuum producing means, whereby a powerful suctional effect is produced between the plate 45 and bed B or its equivalent.

In order to prevent leakage of air into the space enclosed by the sealing device 47-47, a second, inner sealing element 56 having a highly flexible, raised inreaching lip 56', shown in detail in Figure 8, is embedded in a recess 57 formed circuitously in the frame 40 adjacent its inner edge, within the zone occupied by the pockets, the lip portion extending inwardly over the edge of the frame to act as a cushion preventing the passage of air but permitting-the plate to rest firmly on the frame.

The modification depicted in Figure 6 shows a simplified form of frame 60 having a base flange 61 and provided with pockets 62 to contain clamps63 having inreaching upper ends 63, the same being held by a screw 64 make contact with the plate or upper part of the frame.

In Figure 4 a different embodiment is delineated, consisting of a frame 70 for the negative 45 held by clamps 71--71' disposed in pockets 72 and drawn into operative enagement by screws 73, having bevelled heads roln which extend rectangular projections 73'. c

' A packing element 74 havin a lip 74' is fitted into a shallow circumam ient groove 75 of rectangular cross-section in the upper marginal portion of theframe and below it at spaced intervals are threaded sleeves 76 registering with the axes of the screws 73, which are passed through the opening to which the sleeves are fitted. O

The sleeves 76 have central bores to receive stems 77 havin a flange 78 on their inner ends abutting t e sleeves and are provided with a handle 79 at their outer ends.

The stems 77 contain axial openings of angular cross section, receptive of the projections 73' extending inte ally from the heads of the screws 73 so that y turning the handle 79 the clamps may be adjusted without removal or interference with the air seal 74.

In. order to prevent the passage of air within the zone .bounded by the rubber seal 74,

compression springs 80 are disposed within the openings of the stems 77 pressing the stems outwardly to maintain their flanges 7 8 in close contact with the end of the sleeves 76, the sleeves having flanges 81 on their outer ends to impinge on the outer surface of the inwardly extendin lip 56', normall above thesurface of the rame 40 and on w ich the plate 45 is seated, the lip 56' acting to seal the plate and prevent the entrance of air when a vacuum is created between the plates.

The plate 45 is formed with a bevelled edge, and in place of the clamping device 6363; the plate is held to thebed by strips fastened by screws 91 to the frame.

In Figure 7 a bed 95 contains a groove 96 in which is set an air seal element 97 hav- "ing a raised outstanding lip 97, this element surrounding a plate 98. i

A frame 100 carries a second plate 101, extending outwardly beyond the edges of the seal element 97, the plate 101 being held tothe frame 100 by strips 102 secured by screws 103, the arrangement being such as to positively seal the plates in a vacuum.

The inner sealing or filler strip 56, as shown in detail in Figure 8, is preferably tapering in cross section on one or both sides of its body portion to positively fill the recess in which it is, embedded, rendering the passage of air impossible; the advantage arising from its use is apparent.

InFigures land 2 a higher development in frame construction is illustrated, in which the frame 105 preferably has its main outstanding walls inclined outwardly'from the center, or bosses may be provided at intervals having inclined faces 106, at an -angle with its upper edge 107. I

This edge'is recessed, as at 108, to receive the base portion 47 of the outer air seal, the v raised elastic lip-47' of which extends outwardly in the manner before described.

The inner portion of the frame has a lesser recess 109 to receive the inner air seal 56, its inreaching, highly flexible lip 56 extending frame 70, thus forming air tight joints to over the depressed portion 110 of the frame. withstand the vacuum produced within the 40, at a pointbetween the clamp carrying pockets48, showing the circumambient recess' to receiverthe 'com' ressive sealing element 47 having a reduce flexible margin 47.

-As an alternative to the tube 67 in Figure 16, at one point in the frame 40 is an air passage 85in which is fixed a tube 86 and engaged therewith is the flexible hose 37 leading to the suction pump 36 to produce a vacuum by which the negatlve and positive plates,

bed or the contact.-

Another circuitous groove 57 in the frame like may be drawninto proper 40, near its inner marginis fitted. with the highly flexible rubber filler 56, having an At spaced intervals the wallof the frame is recessed from its inner side, the'axis of the annular recesses 111 being at right angles with the inclined faces 106, and intersectin these recesses are openings 112 extending down from the upper edge 107 of the frame.

. These recesses 111 are counterbored at their outer ends, within the frame wall, to rereive elastic gaskets 113, on which are seated the flanges of plugs 114, tight fitting the recesses 111 and having openings 115 in their inner ends to slidably receive npts 116.

Engaged in these nuts are screws 117 entering the recesses 111 through axial openings in the walls of the frame, these screws117 being provided with large knurled heads 118 and flanges 119 to seat on gaskets 120 inter posed. between them and the frame walL,

flanges of the screws are receptive of forked clips 122 by which the screws are retained in Narrow necks 121 between the heads and extremities with inturned bevelled hooks 126 adapted to impinge on the bevelled edges of the plate 45. v

The clamps 125 have midway in their length cylindrical elements 127, extending transversely across the openings 112 to retate and also slide freely therein.

It will now be apparent that upon turning the screws, by their heads 118, extending beyond the confines of the frame and in nowise interfering with the air seals 47 or 56, the nuts 116 will be moved, transmitting motion to the clamps, which, pivoting on the axis of the'cylinders 127, are caused to engage or release the plate 45.

It will further be seen that, by reason of the angularity of the axes of the screws 117, the nuts 116 as they are moved outwardly, draw the clamp downwardly,'thus providing an additional clamping effect upon the plate edges.

Although the openings 112 are open at their tops to any vacuum produced between the elements 4756, leakage of air to theopenilkgs is prevented by the gaskets 113- 120, e ectually sealing the spaces in which the clamping devices operate.

- In the modified form of stand, shown in Figures 11, 12 and 13, a support frame is generally indicated, at 130, the same having two like sides, from the rear of which extend horizontal arms 131 connected at their outer ends by a bar 132. y

The frame uprights133 have central longitudinal slots 134, terminating at their lower ends in semi-circles. At the upper ends of the uprights are forwardly reaching brackets in which are journalled a shaft 135.

Fixed on the ends of the shaft are sprockets 136, around which are trained chains 137 extending downwardly along the outer sides of the upright, to engage other sprockets 138 mounted on studs 139, set in the frame 130 below the plane of the arms 131.

Fixed alongside one of the sprockets 138, on the front side of the machine. is a worm gear 140, meshed with a worm 141, its shaft being carried in brackets on the side of the frame and is'provided with a manually operable crank handle 142.

A lower plate carrier 143, provided with vacuum and air sealing devices, as previously described, has at its center a pair of oppositely extending pintles 144, of semi-circular cross section, adapted to seat in the bottoms of the slots 134 in the uprights, at which time the carrier will be level and rest partially on the bar 132.

Set in the side of the carrier 143, adjacent the bar, is a pin 145, the same being engageable by a hook 146 set in the arm 131, thus holding the carrier firmly in a horizontal position when desired.

Triangular brackets 147 extend outwardly from the rear edges of the carriers, the central members 148 of which carry arms 149 in which are pivoted bars 150, having guides 151 embracing the side edges of the bracket members 148 and are drawn at one end toward the brackets by tension springs 152.

The opposite, outer ends of the pivoted bars 150 are provided with lugs 153 engageable in the slots 134 when the holder is in a reversed position.

It is to be understood that the holders are interchangeable and that a single description sufiices for both, although that shown as uppermost is supplied with prime members.

The pintle elements ,144144 have dove tailed ends 154-154 held in corresponding grooves in the carrier sides and are pressed outwardly towards the faces of the carriers by coiled compression sprin 155- 155.

The outer ends of the pintles 144144 contain grooves 156 receptive of flat stems 157 held by screws therein, these stems carrying studs 158 provided with annular recesses 159, engaged by bands 160 attached in the run of the chains 137.

Thus the studs may be attached to' either of the pintles 144-l44' so that the corresponding carrier may be moved vertically in a horizontal plane, relative to the other carrier resting by its pintles in the bottoms of the slots134. v

\Vhen the carriers are juxtaposed they may. be secured in such relation by a hook lever 161, pivoted on the frame 130 and provided with an operating handle 162. The hook lever 161 also acts to release the guides 153 from the slots permitting the uppermost carrier to rotate between the uprights when it is desired, at other times a hook 163 may be used to retain the lever 161 in its adjusted position.

Thus the carriers may be spaced, tilted, and otherwise maneuvered in an eflfective and convenient manner.

The foregoing disclosure is to be regarded as descriptive and illustrative only, and not arately against the article.

2. In a photo-printing machine, a negative having a frame containing a plurality of independent pockets open at their tops, separate clamps freely contained in the tive, screws passing transversely throu h said.

clamps and pockets in said frame aving heads to urge said clamps against the negative, and means permanently carried by said frame to adjust said-screws.

3. In a photo-printingmachine, a plate frame having a circuitous groove in its face, an endless sealin member partially embedded in the groove and a raised outstanding highly flexible cushion element formed integral with said sealing member.

4. In a photo-printing machine, a plate frame having a circuitous groove in its face, an unbroken flexible sealing member set in the groove, a plurality of independent, open topped pockets in the frame interjacent the groove, an screw actuated means carried in the pockets to clamp a plate in said frame.

'5. In a photo-printing machine, a negative havin a frame containing a plurality of 'space apart independent pockets, clamps in the pockets to impinge on the edges of the negative, screws in said frame having heads to urge said clamps against the negative, means fixed in said'frame to adjust said screws, 9; circuitous groove in said frame an to said pockets, a sealing member disp in said groove, said member coveroperated and a ralsed highly flexible .outsanding element on the outer edge of said membe 6. Inna photo-printing apparatus using a or negative and a sensitized plate, a holder the negative, vacuum suction means for producing contact between the negative and sensitized plate, a sealing member carried by said holder in contact with the sensitized plate, said sealing member being removable, a plurality of independent wedge shaped pockets in said holder, open at their wider upper ,ends; and holding clam s for the negative disposed freely in said poc ets, said clamps being adjustable through openings in said holder, the openings being normally covered by said sealing member.

7. Ina photo-printing machine, a negative having a frame containing a plurality of wedge-shaped, open topped pockets, plate clamps freely disposed in the pockets to impinge on the. edges of thenegative, screws in' said frame having heads to urge said clamps against the negative, manually rotatable means permanently carried by said frame to adjust said screws,and a sealing member c1ring openings throu h which said screws are the negative, a flexible sealing member enclosing said frame covering the openings through which the screws are entered, and manually rotatable means permanently carried by said frame in register with said screws whereby they may be adjusted.

9. In a photo-printing apparatus, a negative having a framecontaining a plurality of independent pockets, clamps in the pockets having inreaching angular upper edges to impinge on the edges of the negative, screws in said frame having heads to urge said clamps against the negative, said screws entering through openings in the outer portion of the frame, sleeves tight fitted to the openings, stems rotatable in said sleeves, means for rotating said stems, and operative connections between said stems and said screws.

10. In a photo-printing apparatus, a nega tive having a frame containing a plurality of independent pockets, clamps in the pockets having inreaching angular upper edges to impinge'on the edges of the negative, screws in said frame having heads-to urge said clamps against the negative, said screws entering through openings in the outer portion of the frame, sleeves tight fitted to the openmgs, stems rotatable in said sleeves, means for rotating said stems, operative connections between said stems and said screws, and a circumambient sealing member carried inthe upper marginal portion of said frame in a plane above said screws.

11. In a photo-printing machine having a negative plate holder, means for sealing by vacuum consisting of an elastic frame carried by the holder surrounding the negative, said frame having a weak edge portion extending outwardly, a second elastic frame carried by said holder interjacent the first frame and means for producing a vacuum between said Nframes when their edges are in contact with thelevel surface of, a solid.

12. In a photo-printing machine having a negative plate holder provided with two spaced apart circuitous channels in its face adjacent its inner and outer edges respectively, an elastic sealing member disposed in a each of the channels, said members having highly flexible lips extending over the inner respective edges of the holder to receive a plate, and means to clamp a plate on said holder.

13. In a photo-printing machine having a negative plate holder provided with two circuitous channels arranged substantially in parallel in its face respectively inner and outer, an elastic sealing member in the inner channel to receive the plate, said member having a raised inreaching flexible lip to yield upon contact with the plate, a plurality of spaced open topped pockets intermediate the channels, clamps loosely contained in said pockets secure a plate on said member, a

second elastic sealing member in the outer channel, a. raised outstanding flexible lip on the second member to contact with a surface pressed thereagainst, and means for creating a. vacuum between the surface and plate.

14. In a photo-printing machine having a negative plate holder provided with a channel in the face closely adjacent its inner edge, a, unitary elastic strip having a body portion embedded in the channel and a. highly fiexible lip overhanging the face of the channel at its inner edge, said inner edge being in a plane below the main port-ion of the face, independently actuated means in each of the four sides of said holder for clamping a plate on the channel face to compress the lip and body of said strip to constitute an air tight joint, a second channel spaced outwardly from the first named channel, a unitary elastic strip having a body portion embedded in the second channel, and a raised outstanding lip extending beyond the face of the holder to form an air-tight joint with the level surface of a solid when brought in contact therewith.

15. A photo-printing frame comprising a plate holder having an inner and outer circuitous channel in its face, plate clamping means spaced at intervals intermediate the channels, elastic air sealing means held in said channels, the inner of said means being in contact with the plate and the outer having a raised outwardly extending edge to contact with a surface, and means for creating a vacuum between the surface and plate within the confines of said sealing means.

16. A photo-printing frame comprising a plate holder having inner and outer endless channels'in its face. elastic sealing means disposed in the channels, a plurality of spaced pockets open at their tops intermediate said channels in each of the four walls of said holder, clamps pivotally and slidably mounted in the pockets, said clamps having elements to impinge on the edges of a plate in said holder, and means operable from the exterior of said holder to coincidently press said clamps inwardly and downwardly.

17 A photo-printing frame comprising a plate holder having inner and outer spaced circuitous channels in its face, elastic sealing means disposedin the channels, a plurality of independent pockets open at their tops in-. termediate said channels in each of the frame I sides, clamps having pivots transversely disposed in said pockets, means at the exterior of said holder to rock said clamps on their pivots, and means combined with the rocking means to draw said clamps downwardly.

18. A photo-printing frame comprising a plate holder having inner and outer spaced circuitous channels in its face, elastic sealing means disposed in the channels, a plurality of pockets open at their tops intermediate said channels in each of the frame sides, clamps pivotally and slidably mounted in the pockets, said clamps having elements to impinge on the edges of a plate in said holder, adjusting screws for said clamps, said screws having their axes at angles with the plane of the plate and their heads outside the holder, nuts actuated by said screws to turn the clamps on their pivots, and means preventing the passage of air to said pockets.

19. A photo-printing frame comprising a plate holder having inner and outer spaced circuitous channels in its face, elastic sealing means disposed in the channels, a plurality of pockets open at their tops intermediate said channels in each of the frame sides, clamps pivotally and slidably mounted in the pockets, said clamps having elements to impinge on the edges of a plate in said holder, and closed loops in their lower ends, nuts having recesses to receive the clamp loops, screws manually rotatable in the holder walls to en gage said nuts, and means to prevent the passage of air to said pockets past said screws.

20. A photo-printing device comprising a stand having two spaced uprights, a. plate holder rotatably mounted therebetween, a sec-- ond plate holder movable towards and from the first holder when both holders are horizontal, means for juxtaposing the second plate holder on either side of the first holder, manually operable chain and sprocket means for raising and lowering said second holder, means in said stand to prevent tilting the second holder until in its lowermost position, air sealing elements cooperative between said holders, and means carried by said stand to produce a vacuum within the zone enframed by said air sealing elements.

21. A photo-printing device comprising a stand having two spaced uprights provided with longitudinal slots in their upper vertical portions, rear reaching horizontal arms having a bar connecting therebetween in a plane below the bottoms of the slots, plate holders having pintles of semi-circular cross section movable in the slots of the uprights, said pintles being removably engaged centrally of the holders and upon opposite sides thereof, said holders being interchangeable, cylindrical bearing studs fixed to the ends of one pair of said pintles, the axes of said studs being in the axial plane of the pintles when said holders are in juxtaposition, means to retain the lower holder horizontally on the arm carried bar, means to clamp both holders when in juxtaposition, and means for rais-- ing the uppermost holder at will.

22. A photo-printing device comprising a stand having two spaced uprights provided with longitudinal slots in their upper portions, rear reaching horizontal arms on the lower portions of said uprights, a bar connecting therebetween at their outer ends constituting a bed, plate holders having brackets on their rear side edges, guide elements pivoted in said brackets engageable in the slots of the uprights whereby the upper holder may be held horizontal, means for moving the upper holder up and down relative to the lower holder, semi-circular half pintles removably engaged on the sides of said holders to move in the slots, and means for clamping the holders when in juxtaposition, said holders being movable angularly on their pintles when in the bottoms of said slots from a horizontal to a vertical position.

23. A photo-printing device comprising a rigid stand having a pair of spaced uprights containing vertical slots, a pair of plate holders, semi-cylindrical members removably engaged in each side edge of both holders to constitute pintles operable in the slots of said uprights when the holders are in close paired relation, independent means to retain each of said holders in horizontal positions, and means for raising and lowering on of said holders relative to the other.

24. A photo-printing device comprising a stand having two spaced uprights provided with longitudinal slots in their upper portions, rear reaching horizontal arms 'on said uprights having abar connecting therebetween, plate holders having pintles of s'emi-v circular cross section movable in the slots of the uprights, said holders being interchangeable, studs engageable with said pin-. tles,the axis of said studs being in the axial lane of-the pintles when said holders are in uxtappsition, means to retain the lower holder horizontally, means carried by the upper holder to engage in the mentioned slots thereby to be held horizontal, means for raising and lowering the 'upper holder, and means for clamping ,both of said holders whereby they may be rotated, raised and lowered as a unit.

25. A photo-prmting device comprising a stand having spaced uprights provided with vertical slots, a bed, plate holders having brackets on their rear side edges, levers pivoted in the brackets, lugs on said levers engageable in the mentioned. slots, resilient means to normally cause engagement thereof, means for disengaging said lugs, means for connecting said holders as a unit when in a horizontal position on said bed, slnd means for raising and lowering the holders independently. Y

26; A photo-printing device comprising a rigid stand having a pair of spaced uprights 7 containing vertical slots, a pair of plate holders, semi-cylindrical members removably engaged in each side edge of both holders to constitute pintles operable in the slots of said by one of said holders may be moved towards 79 and from the other.

In testimony whereof I afiix my signature.

HARRY C. JONES.

uprights when the holders arein close-paired relatlon, resilient means-for pressing pairs of said pintle elements toward each other,

studs'removablyattached to one of each" pair ofsaid pintle members, sprockets 

